/Engine/Source/Runtime/Slate/Public/Framework/Application/SlateApplication.h
Apply any requests from the Reply to the application. E.g. Capture mouse
void ProcessReply ( const [FWidgetPath](API\Runtime\SlateCore\Layout\FWidgetPath) & CurrentEventPath, const [FReply](API\Runtime\SlateCore\Input\FReply) & TheReply, const [FWidgetPath](API\Runtime\SlateCore\Layout\FWidgetPath) * WidgetsUnderMouse, const [FPointerEvent](API\Runtime\SlateCore\Input\FPointerEvent) * InMouseEvent, const uint32 UserIndex )